This is so witty, reminds me of Bernard Shaw:
Once he had his hand in his pocket and asked the audience : "What do you think I am touching?"
The crowd said: Mr. Shaw it is such an improper question. And Shaw goes : take your mind out of the gutter. I am touching my keys.
Later he asked the same question, again having his hand in his pocket. They all responded : We know Mr. Show, you obviously are touching your keys again.
Shaw goes: Wrong, actually I am touching now what you thought before.